Hydraulic rocking press.



Patented Oct. 10, [899.

No. 634,7I9.

H. u. CROWELL.

HYDRAULIC nocxme mess.

(Application filed Apr. 92, 1899.)

3 Sheets-Sheet (No Model.)

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No. 634,7l9.

Patentd on. m, I899. H. m. CROWELL.

HYDRAULIC ROCKING PRESS.

(Application filed Apr. 22, 1899.)

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(No Model.)

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(Application filed Apr. 22, 1899.)

(No Modei.)

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' UNITED STATES PATENT OFFICE.

HENRY M. 'CROWELL, OF MAPLEWOOD, NEIV JERSEY.

HYDRAULIC ROCKING PRESS.

SPECIFICATION forming part of Letters Patent No. 634,719, dated October 10, 1899.

Application 1115i AprilZZ, 1899.

To aZZ whom it may concern:

Be it knownthat I, HENRY M. ORowELL, a citizen of the United States, residing at Maplewood, in the county of Essex and State of New Jersey, have invented certain new and,

useful Improvements in Hydraulic Rocking Presses; and I do hereby declare the. following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to 2c the invention applying more particularly to the construction and ornamentation of articles made of thin silver or other metal for jewelry, tableware, handles, ciasps, buckles, and the like.

A further object is to facilitate the work of thus striking up or raising articles of sheet metal, to secure a more perfectly automatic operation, and to obtain other advan tages and results, some of which may be referred to here 3o inafter in connection with the description of the working parts.

The invention consists in the improved press for operating'dies and inthe arrangements and combinations of parts thereof, all

I substantially as will be hereinafter set forth,

and finally embraced in the clauses of the claims 7 Referring to the accompanying drawings, in'which like letters of reference indicate cor- 4o responding parts in each of the several views,

Figure l is a front elevation of a press of my improved construction, one of the upper shafts of which is in section. Fig. 2 is a side elevation of the same, another shaft being in section and a fly-wheel thereon removed. Fig. 3 is a side elevation of a certain force-can rier. Fig. 4 is a section of the same, taken on line :10. Fig. 5.is. a sectional detail of a slotted bushing which-will be hereinafter more fully described; Fig. 6 is a detail showing the base of the press; and Fig. '7is a sec- Serial No. 714,039. (No model.)

I tion of the same on line y, showing certain hydraulic devices useful in operating the dieholder more clearly.

In said drawings, aindicates asu'itable bedframe of heavy metal, which may be of one integral piece or in separable sections. In the preferred construction, for convenience of manufacture, I prefer to have the bedplate a which carries the press proper, of a separate piece from that portion a which carries the hydraulic pumps and cooperating devices. Upon said frame is arranged a basepiece 5, (shown more clearly in Figs. 2, 6, and 7,) which is centrally cored out and forms a cylinder for a dieholderc, the said die-holder at its lower end being also cylindrical to fit the chamber within the baseb and form a piston adapted to be operated upon by hydraulic influences, as hereinafter described. The top of the said die-holder c is arranged in connection with guides cl d orother steadying means and is provided at the center of its upper end with a seat 0' for the die'r. This said seat may be of any suitable construction, means being provided for holding said die in place, such as a set screw or screws 6. Upon-the said guides'cl is seated near the upper ends thereof a cross-head f, the said crosshead being perforated to receive the bolt-like upper extensions d." of said guides, said guides being flanged, as at g, to provide seats for the said cross-heads and being provided with nuts h, by means of which the said cross-head is firmly and rigidly held in place. The guides d thus serve as supporting-pillars for said cross-heads, and four of such pillars are preferably employed, whichprovide openings between at all sides of the press,'so that the metal to be stamped or impressed may be fed to the die and force. by automatic machinery or by hand from either direction. The said cross-head f provides bearings .for parallel shafts 71 and j, the latter extending out at one side from the cross-head to receive a pulley and balance-wheel k. Upon the upper shaft 2', within a chamber or aperture formed within the cross-head, is arranged an oscillating arm Z, which extends downward to the second shaft j and is there provided with an opening for said shaft jand a bushing m, arranged around said shaft. The said bushing on is provided with a slot m, Figs. 4 and 5, and the said shaft 3' where it lies in said bushing is eccentrically reduced, the eccentric pin or partj of said shaft fitting the slot on of the bushing on, so that when said shaftj rotates in its hearings in the cross-head the said bushing in will be given a reciprocating motion in connection with the arm Z. Upon the said bushing m, in connection with the arm I, is arranged a force-carrying arm n, which is also at its upper end given a similar oscillatory action with the bushing. The lower end of the said force-carrier n is guided to a proper central or approximately central relation to the die by guiding-springs 0 0, which engage suitable cooperating guides 19, so that the lower end of the force-carrier n and its force q will be brought with sufficient exact ness into cooperating relation to the die r.

The force q is provided witha suitable metal face serving to cooperate with an engraved or otherwise shaped face of the die 7', the force serving to press the metal into said die and in the act of forcing it to rock upon the face of said die in such a manner as to cause the metal to flow into place by a swaging or burnishing action rather than by a straight pressure, as heretofore.

The pulley k and shaft j are rotated at a high rate of speed, so that at each upward action of the die the said force will be given several rocking actions or reciprocations upon the upper face of the metal lying on the die.

The action of the force causes the metal to creep into the hollows and recesses of the die, so that by a single reciprocation of the piston the metal is raised or impressed, efiecting very marked elevations and depressions in the sheet metal, conducing to a high grade of ornamentation.

To secure a high pressure and quick action of the die to and from the force, whereby the above results are accomplished with greater facility and without stress upon the workmen, I have operated the said die by hydraulic power, and to this end, in connection with the cylindrical base I) and piston c of the die-carrier, I have employed a cylinder-head Z), closing the lower end of the cylindrical chamber in said base, the said head 1) being provided with inlet and outlet ports 12 b or passages which are in connection with water-supply and return pipes s 3, connecting with a hydraulic pump 25, carried upon the base portion or section a of the frame a.

The hydraulic pump employed is of any suitable construction common in the market, and the details of the same need not necessarily be described here. The said pump 25 is provided with a safety-valve 25, adapted to be regulated by means of a regulating-screw t or other suitable means, by means of which I am enabled to regulate the hydraulic pressure within the cylindrical base. By means of this safety device I am enabled to maintain pressure upon the sheet metal at any desired degree, and should the pressure increase above the proper normal the safety device will automatically act in any ordinary manner to allow the escape of water. Thus when I employ stock which is of a more or less brittle nature I can reduce the pressure and give the work more time in rolling to effect the desired end, and when employing a more tenacious material the power can be increased and the work facilitated.

When the machine is at rest, the pipes s s are in open communication through the cylinder-chamber. When I desire to raise the piston and its die to the force, I close com munication through the return-pipes s by means of a valve 5 having the arm or lever 5 so that the water rises in the cylinder and forces the die-carriers upward and the die into operative relation to the force. This valve is preferably operated by a treadle u, (shown more clearly in Fig. 2,) the said treadle being connected to the arm 5 by a connecting-rod it or in any other suitable manner.

To enable the force to effect the desired rocking movement on the face of the die, the impression-surface thereof is not the exact counterpart of the engraved or sunken surface of the die. The said impression-surface is made while the force is of comparatively soft metal by rocking the force on the face of the die. I thus obtain a somewhat-distorted negative of the positive die and am enabled to rock the force reciprocally over the face of the die when subsequently stamping the sheet metal in the same manner as when preparing the force.

Thus constructed when stamping or impressing the sheet metal but one part of the rocking force will be in hard engagement with the die at a time, like as one part of an ordinary rocker of a rocking-chair engages the floor at a time, and the power due to the impression of the (lie being brought upon but a small portion of the surface of the metal to be impressed at a time the desired flow of the metal into the sunken recesses of the ,engrav-- ing is secured at but a comparatively small expenditure of power.

Having thus described the invention, what I claim as new is 1. The combination with a vertically-recip rocating die, of a jointed force-carrier and means for oscillating the sections at the joint, a force having a rocking motion due to the action of the said carrier, and operating means for the die, substantially as set forth.

2. The improved press, comprising a bedplate a, base-piece I), having a water-cham ber, a pump for forcing fluid into said chamber, a piston 0, having a die r, seated thereon, pillars cl, d, cross-head f, having shafts 't, and j, the latter having an eccentric por tion, a slotted bushing and pulley, an arm Z, carried by the shaft 2', and providing bearings for said bushing, an arm it, carried by said bushing and at its lower end having a force, all said parts being arranged and op erating, substantially as set forth.

3. The improved press, comprising a bedplate, chambered base-piece, pump for forcin g water into the chamber of said base-piece,

a piston, a die seated thereon, pillars, supporting a cross-head, shafts a and j, the latterhavingan eccentric portion, a slotted bushing and a pulley, an arm l, carried by theto ornament the metal, substantially as set forth;

5. The improved press for ornamenting sheet metal, comprising a cylindrical bed, a die seated upon a piston, in said cylindrical bed. hydraulic apparatus for raising and lowering said piston, a jointed force -.carrier, means for operating the same at the joint to efiect a rocking movement of the force, and said force adapted to cooperate with the die to ornament the metal and rock thereon reciprocally, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 17th day of April, 1899.

HENRY M. OROWELL.

\Vitnesses: r

CHARLES H. PELL, 0. B. PITNEY. 

